linux-kernel - [PATCH] scsi_scan: don't dump trace when scsi_prep_async

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Message-Id: <1441033253-24595-1-git-send-email-vkuznets@redhat.com>
Date:	Mon, 31 Aug 2015 17:00:53 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"James E.J. Bottomley" <JBottomley@...n.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Long Li <longli@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH] scsi_scan: don't dump trace when scsi_prep_async_scan() is called twice

The only user of scsi_prep_async_scan() is scsi_scan_host() and it handles
the situation correctly. Move 'called twice' reporting to debug level as
well.

The issue is observed on Hyper-V: on any device add/remove event storvsc
driver calls scsi_scan_host() and in case previous scan is still running
we get the message and stack dump on console.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/scsi/scsi_scan.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f9f3f82..01ad016 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1712,8 +1712,7 @@ static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
 		return NULL;
 
 	if (shost->async_scan) {
-		shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
-		dump_stack();
+		shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__);
 		return NULL;
 	}
 
-- 
2.4.3

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